add prevent computer sleep functionality

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -146,6 +146,9 @@ public class AppController implements Initializable {
     @FXML
     private MenuItem sendToMany;
 
+    @FXML
+    private CheckMenuItem preventSleep;
+
     @FXML
     private StackPane rootStack;
 
@@ -289,6 +292,7 @@ public class AppController implements Initializable {
         lockWallet.setDisable(true);
         refreshWallet.disableProperty().bind(Bindings.or(exportWallet.disableProperty(), Bindings.or(serverToggle.disableProperty(), AppServices.onlineProperty().not())));
         sendToMany.disableProperty().bind(exportWallet.disableProperty());
+        preventSleep.setSelected(Config.get().isPreventSleep());
 
         setServerType(Config.get().getServerType());
         serverToggle.setSelected(isConnected());
@@ -742,6 +746,12 @@ public class AppController implements Initializable {
         EventManager.get().post(new BitcoinUnitChangedEvent(unit));
     }
 
+    public void preventSleep(ActionEvent event) {
+        CheckMenuItem item = (CheckMenuItem)event.getSource();
+        Config.get().setPreventSleep(item.isSelected());
+        AppServices.get().setPreventSleep(item.isSelected());
+    }
+
     public void openFile(File file) {
         if(isWalletFile(file)) {
             openWalletFile(file, true);

src/main/java/com/sparrowwallet/sparrow/AppServices.java

@@ -2,7 +2,6 @@ package com.sparrowwallet.sparrow;
 
 import com.google.common.eventbus.Subscribe;
 import com.google.common.net.HostAndPort;
-import com.samourai.whirlpool.client.wallet.WhirlpoolEventService;
 import com.sparrowwallet.drongo.Network;
 import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.protocol.BlockHeader;
@@ -24,6 +23,7 @@ import javafx.beans.property.SimpleBooleanProperty;
 import javafx.beans.value.ChangeListener;
 import javafx.beans.value.ObservableValue;
 import javafx.concurrent.ScheduledService;
+import javafx.concurrent.Task;
 import javafx.concurrent.Worker;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Node;
@@ -48,6 +48,7 @@ import org.slf4j.LoggerFactory;
 import java.awt.*;
 import java.awt.desktop.OpenFilesHandler;
 import java.awt.desktop.OpenURIHandler;
+import java.awt.event.KeyEvent;
 import java.io.File;
 import java.io.IOException;
 import java.net.*;
@@ -94,6 +95,8 @@ public class AppServices {
 
     private TorService torService;
 
+    private ScheduledService<Void> preventSleepService;
+
     private static Integer currentBlockHeight;
 
     private static BlockHeader latestBlockHeader;
@@ -156,6 +159,7 @@ public class AppServices {
         ratesService = createRatesService(config.getExchangeSource(), config.getFiatCurrency());
         versionCheckService = createVersionCheckService();
         torService = createTorService();
+        preventSleepService = createPreventSleepService();
 
         onlineProperty.addListener(onlineServicesListener);
 
@@ -183,6 +187,10 @@ public class AppServices {
         if(config.isCheckNewVersions() && Network.get() == Network.MAINNET) {
             restartService(versionCheckService);
         }
+
+        if(config.isPreventSleep()) {
+            restartService(preventSleepService);
+        }
     }
 
     private void restartService(ScheduledService<?> service) {
@@ -382,6 +390,39 @@ public class AppServices {
         return torService;
     }
 
+    private ScheduledService<Void> createPreventSleepService() {
+        ScheduledService<Void> preventSleepService = new ScheduledService<Void>() {
+            @Override
+            protected Task<Void> createTask() {
+                return new Task<>() {
+                    protected Void call() {
+                        try {
+                            Robot robot = new Robot();
+                            robot.keyRelease(KeyEvent.VK_F16);
+                        } catch(Exception e) {
+                            log.debug("Error preventing sleep", e);
+                        }
+
+                        return null;
+                    }
+                };
+            }
+        };
+
+        preventSleepService.setPeriod(Duration.minutes(1));
+        return preventSleepService;
+    }
+
+    public void setPreventSleep(boolean preventSleep) {
+        if(preventSleepService != null) {
+            if(preventSleep) {
+                restartService(preventSleepService);
+            } else {
+                preventSleepService.cancel();
+            }
+        }
+    }
+
     public static boolean isTorRunning() {
         return Tor.getDefault() != null;
     }

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -42,6 +42,7 @@ public class Config {
     private boolean showTransactionHex = true;
     private boolean showLoadingLog = false;
     private boolean showUtxosChart = true;
+    private boolean preventSleep = false;
     private List<File> recentWalletFiles;
     private Integer keyDerivationPeriod;
     private File hwi;
@@ -279,6 +280,14 @@ public class Config {
         flush();
     }
 
+    public boolean isPreventSleep() {
+        return preventSleep;
+    }
+
+    public void setPreventSleep(boolean preventSleep) {
+        this.preventSleep = preventSleep;
+    }
+
     public List<File> getRecentWalletFiles() {
         return recentWalletFiles;
     }

src/main/resources/com/sparrowwallet/sparrow/app.fxml

@@ -108,6 +108,8 @@
                     <MenuItem mnemonicParsing="false" text="Sign/Verify Message" accelerator="Shortcut+M" onAction="#signVerifyMessage"/>
                     <MenuItem fx:id="sendToMany" mnemonicParsing="false" text="Send To Many" onAction="#sendToMany"/>
                     <MenuItem styleClass="osxHide,windowsHide" mnemonicParsing="false" text="Install Udev Rules" onAction="#installUdevRules"/>
+                    <SeparatorMenuItem />
+                    <CheckMenuItem fx:id="preventSleep" mnemonicParsing="false" text="Prevent Computer Sleep" onAction="#preventSleep"/>
                 </Menu>
                 <Menu fx:id="helpMenu" mnemonicParsing="false" text="Help">
                     <MenuItem mnemonicParsing="false" text="Show Introduction" onAction="#showIntroduction"/>